Improvement in stop-cocks



UNITET)v STATES PATENT OFFICEO O. C. PARSONS, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN STOP-SOCKS.

To all whom it may concern:

Be it known that I, C. C. PARSONS, of Boston, in the county of Suffolkand State of Massachusetts, have invented an Improved Gonstruction ofStop-Cocks; and I do hereby declare that the following, taken inconnection with the drawings which accompany and form part of thisspecication, is a description of my invention sufficient to enable thoseskilled in the art to practice it.

In that common construction of stop-cocks generally known as theplug-cock 7 much trouble arises during cold weather and in eX- posedsituations from the breaking or bursting ofthe cock, consequent upon thefreezing of liquid contained in the plug of the cock when it is soturned as to close the communication through the cock, the aperturethrough the plug being full of liquid, which is confined therein whenturned as mentioned, without chance to escape, and this expanding in theact of freezing finds vent by breakage of some part of the cock.

To remedy this difficulty is the object of my invention, which consistsin chambering out recesses in the barrel of the cock, which, when theplug is so turned as to close the communication through the cock, shallconnect with the aperture through the plug, forming not wastei passagesto empty the cavity of the plug of its liquid con tents, but air-tightchambers communicating only with the cavity in the plug.

In the drawings, which illustrate a stop-cock embodying my invention,Figure 1 shows the barrel in vertical central section, with the plug inelevation, but with aportion shown as broken away to show theconstruction. Fig. 2 shows a horizontal cross-section through the cook,showing' the plug therein in such position as to leave the aperturethrough the cock fully open. Fig. 3 is a section similar to Fig.2, butshowing the aperture through the cock as closed, and the passage in theplug in communication with the chambers or receptacles in the barrel ofthe cock.

a is the barrel of the cock; b, the plug; c, the opening throught it;anddd are the cham bers in the barrel c.

Suppose the plugin the position shownin Fig. 2, and with fini d o wingfreely through the cock.` Now, it' the plug is turned about forty-vedegrees the opening through the cock will be closed, and the aperturethrough the plug will be and will remain filled with the fluid, in whichcondition, if the duid in the plug freezes, breakage will ensue unlessthe parts are of unusual strength; but if the plugis turned stillfarther, so that the opening c communicates with the chambers cly d, theexpansion of the fluid in c will find vent in the air-chambers el d, andwill only compress the air therein contained, thus preventing rupture ofany of the parts of the cock. t

The proportions of the parts of the cock should be as shown in thedrawings, such that when turning the plug the opening' through the cockshould be entirely closed before the aperture c communicates with thechambers d d. These chambers may be enlarged, as indicated in dottedlines at the right of Fig. 1.

I am aware that cocks have been constructed with waste-passages in thebarrels thereof, by which, under certain circumstances, when the plug isso turned as to shut oft' the dow through the cock, the cavity will beemptied of its liq uid contents. Such a construction I do not claim, norare such passages the equivalents of my closed air-tight chambers, asthe two devices operate upon different principles.

I claim- A stop-cock constructed with one or more closed airtightchambers, d, operating in combination with the opening' through theplug.

In witness whereof I have hereunto set my hand this 25th day of January,A.D. 1866.

O. O. PARSONS.

Witnesses:

J. B. GRosBY, FRANCIS GoULD.

